package com.heima.article.service.impl;

import com.alibaba.fastjson.JSON;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.heima.article.mapper.ApArticleConfigMapper;
import com.heima.article.mapper.ApArticleContentMapper;
import com.heima.article.mapper.ApArticleMapper;
import com.heima.article.service.ApArticleService;
import com.heima.article.service.ArticleFreemarkerService;
import com.heima.common.constants.ArticleConstants;
import com.heima.common.constants.BehaviorConstants;
import com.heima.common.redis.CacheService;
import com.heima.model.article.dtos.ArticleDto;
import com.heima.model.article.dtos.ArticleInfoDto;
import com.heima.model.article.pojos.ApArticle;
import com.heima.model.article.dtos.ArticleHomeDto;
import com.heima.model.article.pojos.ApArticleConfig;
import com.heima.model.article.pojos.ApArticleContent;
import com.heima.model.article.vos.HotArticleVo;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import com.heima.model.mess.ArticleVisitStreamMess;
import com.heima.model.user.pojos.ApUser;
import com.heima.utils.thread.AppThreadLocalUtil;
import com.sun.org.apache.regexp.internal.RE;
import io.seata.spring.annotation.GlobalTransactional;
import io.swagger.models.auth.In;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.checkerframework.checker.units.qual.A;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.*;
import java.util.stream.Collectors;

/**
 * @author 谢金成
 * @date 2024/4/7 21:11
 */
@Service
@Transactional
@Slf4j
public class ApArticleServiceImpl extends ServiceImpl<ApArticleMapper, ApArticle> implements ApArticleService {

    @Autowired
    private ApArticleMapper apArticleMapper;

    private final static short MAX_PAGE_SIZE = 50;

    @Override
    public ResponseResult load(ArticleHomeDto dto, Short type) {
        // 1.校验参数
        // 分页条数校验
        Integer size = dto.getSize();
        if (size == null || size == 0) {
            size = 10;
        }
        // 分页的值不超过50
        size = Math.min(size, MAX_PAGE_SIZE);

        dto.setSize(size);

        // 校验参数
        if (!type.equals(ArticleConstants.LOADTYPE_LOAD_MORE) && !type.equals(ArticleConstants.LOADTYPE_LOAD_NEW)) {
            type = ArticleConstants.LOADTYPE_LOAD_MORE;
        }

        // 频道参数校验
        if (StringUtils.isBlank(dto.getTag())) {
            dto.setTag(ArticleConstants.DEFAULT_TAG);
        }

        // 时间校验
        if (dto.getMaxBehotTime() == null) {
            dto.setMaxBehotTime(new Date());
        }

        if (dto.getMinBehotTime() == null) {
            dto.setMinBehotTime(new Date());
        }

        // 2.查询
        List<ApArticle> articleList = apArticleMapper.loadArticleList(dto, type);

        // 3.结果返回
        return ResponseResult.okResult(articleList);
    }

    @Autowired
    private ApArticleConfigMapper apArticleConfigMapper;

    @Autowired
    private ApArticleContentMapper apArticleContentMapper;

    @Autowired
    private ArticleFreemarkerService articleFreemarkerService;

    /**
     * 保存app端相关文章
     * @param dto
     * @return
     */
    @Override
    @GlobalTransactional
    public ResponseResult saveArticle(ArticleDto dto) {
        // 1.检查参数
        if (dto == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }

        ApArticle apArticle = new ApArticle();
        BeanUtils.copyProperties(dto, apArticle);

        // 2.判断是否存在id
        if (dto.getId() == null) {
            // 2.1 不存在id 保存 文章 文章配置 文章内容
            // 保存文章
            save(apArticle);

            // 保存配置
            ApArticleConfig apArticleConfig = new ApArticleConfig(apArticle.getId());
            apArticleConfigMapper.insert(apArticleConfig);

            // 保存内容
            ApArticleContent apArticleContent = new ApArticleContent();
            apArticleContent.setArticleId(apArticle.getId());
            apArticleContent.setContent(dto.getContent());
            apArticleContentMapper.insert(apArticleContent);
        } else {
            // 2.2 存在id 修改 文章 文章内容
            // 修改文章
            updateById(apArticle);

            // 修改文章内容
            ApArticleContent apArticleContent = apArticleContentMapper.selectOne(Wrappers.<ApArticleContent>lambdaQuery().eq(ApArticleContent::getArticleId, apArticle.getId()));
            apArticleContent.setContent(dto.getContent());
            apArticleContentMapper.updateById(apArticleContent);
        }

        // 异步调用 生成静态文件上传Minio中
        articleFreemarkerService.buildArticleToMinio(apArticle, dto.getContent());

        // 3.结果返回 文章的id
        return ResponseResult.okResult(apArticle.getId());
    }

    @Autowired
    private CacheService cacheService;

    @Override
    public ResponseResult loadArticleBehavior(ArticleInfoDto dto) {
        // 1.检测参数
        if (dto == null || dto.getArticleId() == null || dto.getAuthorId() == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }

        boolean isfollow = false, islike = false, isunlike = false, iscollection = false;

        ApUser user = AppThreadLocalUtil.getUser();
        if (user != null) {
            // 点赞
            String likeBehaviorJson = (String) cacheService.hGet(BehaviorConstants.LIKE_BEHAVIOR + dto.getArticleId().toString(),
                    user.getId().toString());
            if (StringUtils.isNotBlank(likeBehaviorJson)) {
                islike = true;
            }
            // 不喜欢
            String unlikeBehaviorJson = (String) cacheService.hGet(BehaviorConstants.UN_LIKE_BEHAVIOR + dto.getArticleId().toString(),
                    user.getId().toString());
            if (StringUtils.isNotBlank(unlikeBehaviorJson)) {
                isunlike = true;
            }
            // 收藏
            String collectionBehaviorJson = (String) cacheService.hGet(BehaviorConstants.COLLECTION_BEHAVIOR + user.getId().toString(),
                    dto.getArticleId().toString());
            if (StringUtils.isNotBlank(collectionBehaviorJson)) {
                iscollection = true;
            }
            // 关注
            Double score = cacheService.zScore(BehaviorConstants.APUSER_FOLLOW_RELATION + user.getId().toString(),
                    dto.getAuthorId().toString());
            if (score != null) {
                isfollow = true;
            }
        }

        Map<String, Object> resultMap = new HashMap<>();
        resultMap.put("isfollow", isfollow);
        resultMap.put("iscollection", iscollection);
        resultMap.put("islike", islike);
        resultMap.put("isunlike", isunlike);

        return ResponseResult.okResult(resultMap);
    }

    /**
     * 根据参数加载文章列表
     * @param type 1 加载更多 2 加载最新
     * @param dto
     * @param firstPage 是否首页
     * @return
     */
    @Override
    public ResponseResult load2(ArticleHomeDto dto, Short type, boolean firstPage) {
        if (firstPage) {
            String jsonStr = cacheService.get(ArticleConstants.HOT_ARTICLE_FIRST_PAGE + dto.getTag());
            if (StringUtils.isNotBlank(jsonStr)) {
                List<HotArticleVo> hotArticleVoList = JSON.parseArray(jsonStr, HotArticleVo.class);
                return ResponseResult.okResult(hotArticleVoList);
            }
        }

        return load(dto, type);
    }

    /**
     * 更新文章的分值, 同时更新缓存中的文章数据
     * @param mess
     */
    @Override
    public void updateScore(ArticleVisitStreamMess mess) {
        // 1.更新文章的阅读数, 点赞, 收藏, 频率的数据量
        ApArticle apArticle = updateArticle(mess);
        // 2.计算文章的分值
        Integer score = computeScore(apArticle);
        score = score * 3;
        // 3.替换当前文章对应频道的热点文章
        replaceDataToRedis(apArticle, score, ArticleConstants.HOT_ARTICLE_FIRST_PAGE + apArticle.getChannelId());
        // 4.替换推荐的热点文章
        replaceDataToRedis(apArticle, score, ArticleConstants.HOT_ARTICLE_FIRST_PAGE + ArticleConstants.DEFAULT_TAG);
    }

    private void replaceDataToRedis(ApArticle apArticle, Integer score, String key) {
        String articleListStr = cacheService.get(key);
        if (StringUtils.isNotBlank(articleListStr)) {
            List<HotArticleVo> hotArticleVoList = JSON.parseArray(articleListStr, HotArticleVo.class);

            boolean flag = true;

            // 如果缓存中存在该文章, 只需要更新分值
            for (HotArticleVo hotArticleVo : hotArticleVoList) {
                if (hotArticleVo.getId().equals(apArticle.getId())) {
                    hotArticleVo.setScore(score);
                    flag = false;
                    break;
                }
            }

            // 如果缓存中不存在, 查询缓存中分值最小的一条数据, 进行分值比较, 如果该文章的分值大于缓存的分值, 则替换
            if (flag) {
                if (hotArticleVoList.size() >= 30) {
                    hotArticleVoList = hotArticleVoList.stream().sorted(Comparator.comparing(HotArticleVo::getScore).reversed()).collect(Collectors.toList());
                    HotArticleVo lastHot = hotArticleVoList.get(hotArticleVoList.size() - 1);
                    if (lastHot.getScore() < score) {
                        hotArticleVoList.remove(lastHot);
                        HotArticleVo hotArticleVo = new HotArticleVo();
                        BeanUtils.copyProperties(apArticle, hotArticleVo);
                        hotArticleVo.setScore(score);
                        hotArticleVoList.add(hotArticleVo);
                    }
                } else {
                    HotArticleVo hotArticleVo = new HotArticleVo();
                    BeanUtils.copyProperties(apArticle, hotArticleVo);
                    hotArticleVo.setScore(score);
                    hotArticleVoList.add(hotArticleVo);
                }
            }

            hotArticleVoList = hotArticleVoList.stream().sorted(Comparator.comparing(HotArticleVo::getScore).reversed()).collect(Collectors.toList());
            System.out.println("key:" + key + ", value:" + hotArticleVoList );
            cacheService.set(key, JSON.toJSONString(hotArticleVoList));
        }
    }

    /**
     * 更新文章行为数据
     * @param mess
     */
    private ApArticle updateArticle(ArticleVisitStreamMess mess) {
        ApArticle apArticle = getById(mess.getArticleId());
        apArticle.setCollection((apArticle.getCollection()==null?0:apArticle.getCollection())+mess.getCollect());
        apArticle.setComment((apArticle.getComment()==null?0:apArticle.getComment())+mess.getComment());
        apArticle.setLikes((apArticle.getLikes()==null?0:apArticle.getLikes())+mess.getLike());
        apArticle.setViews((apArticle.getViews()==null?0:apArticle.getViews())+mess.getView());
        updateById(apArticle);

        return apArticle;
    }

    /**
     * 计算文章的具体分值
     *
     * @param apArticle
     * @return
     */
    private Integer computeScore(ApArticle apArticle) {
        Integer score = 0;
        if (apArticle.getLikes() != null) {
            score += apArticle.getLikes() * ArticleConstants.HOT_ARTICLE_LIKE_WEIGHT;
        }
        if (apArticle.getViews() != null) {
            score += apArticle.getViews();
        }
        if (apArticle.getComment() != null) {
            score += apArticle.getComment() * ArticleConstants.HOT_ARTICLE_COMMENT_WEIGHT;
        }
        if (apArticle.getCollection() != null) {
            score += apArticle.getCollection() * ArticleConstants.HOT_ARTICLE_COLLECTION_WEIGHT;
        }
        return score;
    }
}
